Hsien-Yi Chiu1, Sung-Jan Lin2. 1. Department of Dermatology, Hsin-Chu Branch, National Taiwan University Hospital, Hsin-Chu2Department of Dermatology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei3Institute of Biomedical Engineering, Colleg. 2. Department of Dermatology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei3Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei4Research Cent.